Study on Ductility Dip Cracking susceptibility in Filler Metal 82 during welding

doi:10.1007/s11706-011-0130-8

Front Mater Sci

2011, Vol. 5

Issue (2) : 203-208 https://doi.org/10.1007/s11706-011-0130-8

RESEARCH ARTICLE

Study on Ductility Dip Cracking susceptibility in Filler Metal 82 during welding

Jing-Qing CHEN, Hao LU(

), Wei CUI

School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

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Abstract

In this paper, Ductility Dip Cracking (DDC) susceptibility in Inconel600 companion Filler Metal 82 (FM82) under different stress states is investigated. Inconel600 is a Ni-Cr-Fe alloy with excellent resistance to general corrosion, localized corrosion, and stress corrosion, which has been widely used in nuclear power plants. However, the companion FM82 has been shown to be susceptible to DDC in welding process. To resolve the problem, this work is mainly focused on evaluating DDC susceptibility in FM82 in welding process. First of all, Strain to Fracture (STF) test is used to achieve the DDC criterion under simple stress state, and the formation mechanism of DDC was explained. Real welding is a process with complex stress state. Later, to get the DDC susceptibility under complex stress state, models about multi-pass welding were built up by means of finite element method. According to numerical simulation results, relationship of deformation and temperature history is achieved. Moreover, susceptible locations and moments could be determined associated with STF results. The simulation results fairly agree with welding experiment from another research.

Keywords Ductility Dip Cracking (DDC) welding Inconel600 numerical simulation

Corresponding Author(s): LU Hao,Email:luhao@sjtu.edu.cn

Issue Date: 05 June 2011

Cite this article:

Jing-Qing CHEN,Hao LU,Wei CUI. Study on Ductility Dip Cracking susceptibility in Filler Metal 82 during welding[J]. Front Mater Sci, 2011, 5(2): 203-208.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-011-0130-8
https://academic.hep.com.cn/foms/EN/Y2011/V5/I2/203

Fig.1 Schematic diagram of sample: welding orientation; shape of samples.

Fig.2 Temperature history loading.

Fig.3 Stress-strain curves of FM82 at different temperatures.

Fig.4 The critical strain at different temperatures.

Fig.5 Surfaces of 4% at different temperatures: 900oC; 1000oC; 1100oC; 1200oC.

Fig.6 Crack morphology at 900°C with 4% strain by optical microscope and at 1150°C with 4% strain by SEM.

Fig.7 DDC cracks in nickel-based alloy weld joint.

Fig.8 Model of multi-pass welding.

Fig.9 Temperature of weld center changing with time at different passes.

Fig.10 Equivalent strain and temperature changing with time at 3 mm from weld with speed of 2 mm/s.

Fig.11 Equivalent strain changing with temperature of different distances from center of weld: the first pass; the second pass; the third pass.

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